Mine-car brake



s..1. SPROCK AND R. DUNN -MINE CAR BRAKE. APPLIQAUON FILED MAR. 30, 1921.

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- MINE CAR BRAKE. APPLICATIION FILED MAR. 30, 1921.

Z 2. 9 1T 3 14 es DU uF. Tuw d2 e t n e t a D1 STANLEY J. SPROCK AND ROBERT DUNN, OF CLARKSVILLE, PENNSYLVANIA.

MINE-OAR BRAKE.

T0 all whom it may concern: 1

Be it known that we, STANLEY J. SrRooK and ROBERT DUNN, citizens of the United States of America, residing at Clarksville, in the county of Greene and State 01" Pennsylvania, have invented certain new and useful Improvements in Mine-Car Brakes, of which the following is a specification.

This invention is directed to an improvement in brakes for mining cars or the like, including specifically a construction wherein the brakes used are readily and conveniently replaceable when worn, without the necessity of dismantling the entire structure.

The improved construction comprises a carrier, Preferably of metal and mounted for vertical movements on the car and with relation to the wheels, through the medium of a hand lever or similar means. This carrier is constructed to receive-and rigidly hold opposing brake shoes, which are preferably of wood, the means for holding the shoes in operative connection with thecarrier, permitting the convenient removal and replacement of either shoe at will and without necessarily disturbing the carrier.

In the drawings Fig. 1 is a view in sideelevation showing a mine car provided with the improved brake.

Fig. 2 is an end elevation of the same.

Fig. 3 is an enlarged elevation of the carrier and brake shoes.

Fig. 4 is a section on line 44 of Fig. 3.

Fig. 5 is a. side view, partly insection, of the operating bar.

Fig. 6 is a broken edge View of the same.

In mining cars of the type for which the improved brake is more particularly designed, the braking operation is generally carried out by the miner or other attendant, who is riding on the car or cars in the mine to orfrom the cage. It is important that these cars be provided with brakes, and of equal importance that the brakes be kept in effective working order, as in the absence of brakes, the car is useless in ordinary mine work until repaired.

As ordinarily constructed, the brakes for cars of this type are constructed of metal, and when worn, require more or less blacksmith and machine work to repair or reconstruct, thereby resulting in the loss of the use of the car for a considerable period. The present invention is designed to avoid this loss of the use of the car, and to pro- Specification of Letters Patent. Patented June 13, 1922.

Serial No. 456,988.

I is formed to provide brake block housings,

to provide which the casting includes the top wall 5 extending from the upper edge of the rear wall for the full thickness of the abutment, and inner walls 6 depending from the abutment in line with the outer surfaces of the abutment the inner walls of the housing. The outer edge of the upper wall 5 has a short depending ledgewall'Y, and the lower edge of the inner wall 6 has an outthereof, providing with said outer surfaces standing supporting ledge wall 8. The

ledge walls 7 and 8 are of the full width of the housing, but of comparatively short length, and the rear wall 2 of the casting'is cut away on a curved line 9 from the free edges of the respective ledge walls.

There is thus provided on each side of the abutment a brake shoe housing, each housing havmg a rearwall, an upper wall and an inner side wall for the fulldimension of the housing, and short bottom and outer side; ledge walls of the full width of the housing.

Each housing is thus fully open from beneath except for the ledge Wall 8, and is fully open at the front or outer side.

A pin 10 projects from the rear wall 1 within the housing, and transversely of the housing ata point substantially equidistant from the topwall5 and the abutment. Pin 10, which is of substantial diameter,'projects outwardly beyond the plane of the outer surface of the carrier, and is formed in such projecting portion with an opening 11, for a purpose which will presently appear.

Brake shoes 12, preferably of wood, are designed to seat in the respective housings, bearing between the walls described and having lower edges 13 and outer side edges 14 of greater length than the ledge walls or" the housing. The lower portion of the brake shoe is curved in coincidence with the wheel curvature to provide a braking surface 15. Each brake shoe is formed with an opening 16 to snugly engage the pins 10, and following the obvious application of the brake shoes, a bar 17 is fitted over the projecting ends of the pins 10 and wedge keys 18 are passed through the openings 11 in the pins beyond the bar 17 and temporarily secured by cotter pins 19 or the like.

It is thus apparent that either or both brake shoes may be readily and conveniently removed and replaced without the necessity of interfering with the carrier proper. Thus a worn shoe or shoes may be removed and new shoes applied without loss of time and practically without loss of the use of the car. or

In mine cars of the type contemplated, the carrier is supported upon an operating bar having an enlarged end 20 and reduced end 21 adapted to pass through an opening 22 in the abutment, the bar being removably secured to the carrier through the engage ment of the shoulder between the enlarged and reduced ends bearing upon the top of the abutment at the bottom of the angular recess 4 and a pin 22 passed through an.

opening 23 in the bar below the abutment. Thus the carrier may be conveniently removed from the bar when desired. The bar is supported at its lowed end in a guide 24 fixed to the car and a spring 25 assists in elevating the carrier in the release of the brakes. The brakes, of-which there is one on-each side of the car, are applied through a lever 26 pivotally supported at one end of the car and connected above and below the pivots through links 27 with a bar 28 fixed to and extending at right angles from rods 29 revolubly supported in bearings 30 fixed to the sides of the car. The ends of the rods adjacent the braking mechanism have angle bars 31 which may be adjustably secured between the arms 32 formed at the upper end of the bar 20, holes 33 providing for the adjustable connection. Obviously through the operation of the lever, the brakes on both sides of the car may be set or re-' leased at will.

Claims 1. A brake for mine cars comprising a carrier having brake shoe housings open at the front, and means for removably securing brake shoes in said housings.

ment, a brake shoe housing on each side of the abutment, said housings being fully open at the front, a pm projecting from the rear wall of each housing, a brake shoe to snugly fit within the housingand engage said pin,

and means engaging the pins beyond the brake shoes to removably secure said shoes 1n posltlon.

5. A brake carrier having a central abutment, a brake shoe housing on each side of the abutment, said housings being fully open at the front, a pin projecting from the rear wall of each housing, a brake shoe to snugly fit within the housing and engage said pin, a single bar to engage both pins and overlie the'brake shoes, and means to;

secure the bar against separation from the pms. I

6. A brake shoe structure comprising a imetallic casing having a solid central abut ment, hollow brake shoe housings at op-' posite sides of the abutment and opening toward the front, means integral with the housing to receive brake shoes, and a single member for engaging said means beyond the brake shoes.

7 A brake shoe structure comprising a metallic casing having a solid central abutment, hollow brake shoe housings at opposite sides of the abutment and opening toward the front, means integral with the housing to receive brake shoes, a single member for engaging said means beyond the brake shoes, and an operating bar passed through the abutment and remov- 'ably connected thereto.

In testimony whereof we affix our signatures.

STANLEY J. sPRooK. ROBERT DUNN. r 

